Hubs can be voted: useful, funny, awesome, beautiful and/or interesting. Do you think there should be "negative" words as well or is the down-vote button sufficient?
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Very true about the differing opinions. I agree that a private message would be more appropriate, as the writer may be embarrassed/discouraged by a harsh public comment.
Good point. I could see personal opinions/differences swaying the reader.
I think if the comments were purely technical they could be helpful, but like yourself and others said they shouldn't be able to be swayed by personal opinions on the subject. Maybe the comment could be viewed only by the writer?